Mechanisms of metal stabilization in cementitious matrix: Interaction of c3s paste and copper oxide
Journal
Toxicological & Environmental Chemistry
Journal Volume
42
Journal Issue
3-4
Pages
137-148
Date Issued
1994
Author(s)
Abstract
Cement constituent‐tricalcium silicate (C3S)‐was synthesized as a model binder for mechanistic investigation on solidification/stabilization process. X‐ray diffraction, scanning electron microscopy, and energy dispersive analysis of X‐ray using micro‐probe and line scanning techniques were used in this study. A sandwich sample consists of C3S paste, CuO, and copper foil layers was developed for investigating the possible interactions between hydrated C3S and CuO which served as model metal‐bearing sludge. We verify that the interactions between C3S paste and CuO can be reasoned in two models. The chemical interactions do occur at the interfacial zone between the hydration product containing Ca of C3S paste and CuO, and a new phase was developed which consists of Ca and Cu. The new phase identified here probably has Ca to Cu ratio about 0.59. The other phenomena observed was that the hydration product containing Ca and Si of C3S paste and CuO system do not reveal any evidences for the possible chemical interactions but only physical diffusion at the interfacial zone. The interactions of C3S and CuO were defined as two models: chemical reaction with new phase generated and physical diffusion.
Type
journal article